Muscle layers - O; I; A; N

Question 1

What’s the ORIGIN of Levator scapulae m?

Answer 1

Transverse Processes C1-C4

Question 2

What’s the ORIGIN of the Trapezius m?

Answer 2

• medial portion of superior nuchal line
• external occipital protuberance
• ligamentum nuchae
• spinous processes and supraspinous ligament of C7-T12

Question 3

What’s the INNERVATION of Levator scapulae m?

Answer 3

Dorsal Scapular and Cervical nerves

Question 4

What’s the ORIGIN of Rhomboid minor m?

Answer 4

Spinous Processes C7-T1

Question 5

What’s the ACTION of Rhomboid minor m?

Answer 5

• retract scapula

- rotate point of shoulder lateral angle down

Question 6

What’s the ORIGIN of Rhomboid major m?

Answer 6

Spinous Processes T2-T5

Question 7

What’s the INSERTION OF Rhomboid major m?

Answer 7

medial border of scapula inferior to root of scapular spine.

Question 8

What’s the ACTION of Rhomboid major m?

Answer 8

• retract scapula

- rotate point of shoulder lateral angle down

Question 9

What’s the ORGANIZATION of the 2nd layers back muscles?

Answer 9

Extrinsic Intermediate

Question 10

What’s the ACTION of the Trapezius m?

Answer 10

• whole: retract scapula
• upper: elevate scapula
• lower: depress scapula

Question 11

What’s the INSERTION of Rhomboid minor m?

Answer 11

medial border of scapula at level of root of scapular spine

Question 12

What’s the INNERVATION of the Trapezius m?

Answer 12

1. accessory cranial nerve XI

2. C3-C4 spinal nerves

Question 13

What’s the INSERTION of the Trapezius m?

Answer 13

• spine and acromion process of scapula

- lateral 1/3 of clavicle

Question 14

What’s the INSERTION of Serratus posterior superior m?

Answer 14

Upper ribs (2-5)

Question 15

What’s the ORIGIN of Serratus posterior inferior m?

Answer 15

Spinous processes T11-L2

Question 16

What’s the ORIGIN of Serratus posterior superior m?

Answer 16

Spinous processes C7-T3

Question 17

What’s the ACTION of Splenius capitis m and Splenius cervicis m?

Answer 17

1. Bilateral - extend head and neck

2. Unilateral - lateral flex neck and rotate face toward same side

Question 18

What’s the INNERVATION of Splenius capitis m and Splenius cervicis m?

Answer 18

dorsal rami in the area

Question 19

What’s the ORIGIN of Splenius capitis m and Splenius cervicis m?

Answer 19

1. ligamentum nuchae

2. Spinous processes C7-T6

Question 20

What’s the INSERTION of Splenius capitis m and Splenius cervicis m?

Answer 20

1. Skull - lateral aspect superior nuchal line of occiput and mastoid process of temporal bone
2. Transverse processes C1-C3

Question 21

Which muscles are in the FIRST layer?

Answer 21

1. Trapezius m.

2. Latissimus dorsi m.

Question 22

What’s the INNERVATION of Latissimus dorsi m?

Answer 22

thoracodorsal

Question 23

What’s the INSERTION of Latissimus dorsi m?

Answer 23

humerus

Question 24

Which muscles are in the SECOND layer?

Answer 24

1. Levator scapulae m.
2. Rhomboid minor m.
3. Rhomboid major m.

Question 25

What’s the ACTION of Levator scapulae m?

Answer 25

elevate scapula

Question 26

What’s the INNERVATION of Rhomboid minor m?

Answer 26

dorsal scapular

Question 27

Whats the INNERVATION of Rhomboid major m?

Answer 27

dorsal scapular

Question 28

What’s the ACTION of Serratus posterior superior m?

Answer 28

raise ribs (forced inspiration)

Question 29

What’s the ACTION of Serratus posterior inferior m?

Answer 29

depress ribs (forced expiration)

Question 30

What’s the INSERTION of Serratus posterior inferior m?

Answer 30

lower four ribs (9-12)

Question 31

What’s the ORGANIZATION of the third layers back muscles?

Answer 31

Extrinsic deep

Question 32

What’s the ACTION of Latissimus dorsi m?

Answer 32

1. extend
2. adduct
3. medial rotate (arm)

• hand cuff muscle

Question 33

What’s the ORGANIZATION of the first layers back muscles?

Answer 33

Extrinisic superficial

Question 34

Which muscles are in the FOURTH layer?

Answer 34

1. Splenius capitis m.

2. Splenius cervicis m.

Question 35

What’s the INSERTION of Levator scapulae m?

Answer 35

medial border of scapula to superior angle

Question 36

What’s the ORIGIN of Latissimus dorsi m?

Answer 36

• Spinous process and supraspinous ligament T6-T12
• ilia crest
• lower 4 ribs
• thoracolumbar fascia

Question 37

Which muscles are in the THIRD layer?

Answer 37

1. Serratus posterior superior m.
2. Serratus posterior inferior m.

*Note: these act as accessory muscles of respiration

Question 38

What’s the INNERVATION of Serratus posterior superior m?

Answer 38

intercostal nerves (ventral rami) in the area

Question 39

What’s the INNERVATION of Serratus posterior inferior m?

Answer 39

intercostal nerves (ventral rami) in the area